Field strength meter



FIG. 1 is a front perspective view of a field strength meter showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a front elevational view thereof with the antenna in the extended position;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and

FIG. 8 is a rear elevational view thereof. 

The ornamental design for a field strength meter, as shown and described. 